Multiple fluid airbrush



Filed Jan. l2, 1945 Patented Nov. 28, 1950 UNITED STATES PATENT OFFICEMULTIPLE FLUID AIRBRUSH Jens A. Paasche, Chicago, Ill.

Application January 12, 1945, Serial No. 572,516

1 Claim. l

The present invention relates to a multiple fiuid airbrush of the typecapable of projecting a plurality of diiferent liquids.

I-Ieretofore it has been found convenient in certain spraying andcoating operations to apply a coating by separately spraying several ofthe ingredients. For example in the application of latex, two diiferentliquids are applied to provide a more satisfactory coating. Similarly inthe application of certain paints and plastic compounds two differentliquids are projected in a mist toward the object to be coated toprovide a more uniform and more satisfactory coating. Heretoforerelatively complicated double spray heads have been provided for suchoperations. While in certain instances it may be of some advantage toemploy such arrangement, in many other instances it is deemed that suchcomplicated structure is diicult to handle and is expensive tomanufacture. Therefore in accord ance with the present invention arelatively simple arrangement is provided whereby a plurality of iiuidsare readily controlled in order to project a coating and the like.

It, therefore, is an object of the present invention to provide animproved multiple duid airbrush which is relatively simple tomanufacture and to operate.

Other and further objects of the present invention subsequently willbecome apparent by reference to the following description taken inconnection with the accompanying drawing wherein Figure 1 is a side Viewof a multiple fluid airbrush constructed in accordance with the presentinvention;

Figure 2 is a cross sectional view of a portion of the apparatus shownin Figure l as seen in the direction of the arrows along the line 2 2;

Figure 3 is a cross sectional view of the apparatus shown in Figure l asseen in the direction of the arrows along the line 3 3;

Figure 4 is a cross sectional view of Figure 1 looking forwardly alongthe line 4--4 in the drection of the arrows;

Figure 5 is a perspective view of the cylindrical body portion of theapparatus shown in Figure l;

Figure 6 shows a handle supporting element.

Referring to the drawing it will be seen that there has been provided amultiple fluid airbrush comprising a generally cylindrical body l0 whichhas a forwardly threaded portion I2 and a rearwardly threaded portion IIl. Extending toward the rear of the gun beyond the threaded portion I4is a coaxial member I6 of lesser diameter ill) arranged to serve as asupport for a valve actuating mechanism. The body IB is providedadjacent its underside with an elongated slot I8 connected to a narrowerslot 2B. The narrower slot 2B receives the handle supporting member 22which extends through a suitable handle 2A readily secured in positionby a nut 26 engaging the threaded portion 23 of the supporting member22. Adjacent the upper end of the handle 24 there is provided anadjusting screw 3Q which controls the degree of actuation of a trigger32. The trigger is pivotally mounted from a cross pin 3f! at anintermediate point on the body i0. The trigger 32 has at an intermediatepoint a recess 36 which engages the end of an actuating member 38 havingat its other end a ball portion 4t supported within a socket member 42.The socket member 62 is arranged at the end of a cylindrical member orrod lili connected to a valve member 46. The valve member :it is biasedtoward closure by a suitable spring 48 bearing against a screen 5B. Thevalve it cooperates with a valve seat 52 formed in a valve supportingmember 54 which engages the threaded portion l i of the body lil. Thescreen 5B against which the spring 18 bears is retained in position by athreaded ring 55. outer end is adapted to be engaged by a threaded ringnut 53 for connecting a suitable iiexible conduit or hose @il thereto.rlhe hose or conduit 6i) is arranged to be connected to a fluid underpressure.

The space between the end of the cylindrical bodv member l! and theinside of the valve supporting member 55 which forms a chamber 62 isconnected by a conduit S4 shown in Figure 1 to a coaxial opening 65 morereadily seen in Figures 2 and 3. The forward end of the body ID isconnected by a threaded ring E8 to a suitable coupling member 'lll whichengages a multiple passage head l2. The multiple passage head has apassage 'ill communicating with the coaxial passage @t of the body li).The passage i4 terminates in an internal nozzle 15. The other fluidpassages 'i8 and Si! are connected by a suitable coupling means BZ and84 to iiexible iluid conduits 86 and t8 each of which is connected Ato adifferent uid source of liquid. Interposed in the fluid conduits 'i3 and3@ are valve seats dii and 92 adapted to be engaged by valves 94 and 95.Each of the valves 94 and 96 is manually adjustable so that the amountof liquid or fluid passing through the conduits 18 and 80 may becontrolled thereby permitting a different propor- The member 54 adjacentits` tion of the dilerent fluids to be projected by the apparatus.

Just above the valve seats 90 and 92 the member 'I2 is enlarged toprovide annular chambers 98 and |00 communicating with forwardly eX-tending fluid passages |02 and |04. The passages |02 and |04 terminateadjacent the interior nozzle 16. The combining nozzle |05 is retained inposition by a suitable fastening or couplingring 498. .The nozzle |06serves to project the two liquids or fluids supplied from the conduits18 and 00 by virtue of the fluid proj ected through the interior nozzle16, which iiuid is controlled by the manual actuation of rthe trigger32. The valve head 94 is supported by a Valve stem I0 which issurrounded by a resilient gasket-like member H2. The valve stem H0 isadjustably positioned by virtue of the threaded portion of the valveposition adjusting vmember which terminates in a calibrated thumb screwHcooperating with a suitable graduation such as H9 on the `side of themember '12. Theresilient rubber-like gasket E52 serves to maintain thevalve in any desired manually adjusted vposition. Similarlythe valvehead 99 is secured to a valve-stem |29 which in turn is surrounded bya'resilient retaining gasket or member |22. A threaded portion |24interconnects the valve stem with the manually adjustable screw member|26. l

In operation the conduit 90 is normally connected to a source of fluidsuch as air under pressure. Each of the other conduits 'iii and 99 isconnected to a suitable source of iiuid or liquid of a characteristicdependent upon the type of coating to be applied to an object. Byadjustment of thescrew members H' and E25 the proportion of the twomaterials or fluids may be regulated so as to provide the desiredcharacteristlcs te the coating. The yprojection of the Vcoating materialis started and stopped by Vmanual actuations of the trigger 32 whichcontrols the opening and closing of the valve comprising the valve seat52 and valve head i9 interposed between the fluid conduit 09 and thehuid conduit 9G contained within the body i9. The amount of iiuid underpressure supplied by the actuation Vof the trigger 32 is controlled bythe adjustment of the stop screw 39 positioned on the forward Suriaceofthe handle 24. The handle 24 which is held in position by the bolt-likemember 22 is retained in position by the nut 25 engaging 'the threadedend portion 23 of the bolt-like member 22 In the other extremity thesupporting -member 22 is provided with a head portion |29 immediatelybeneath which there is a reduced or recessed portion |39 so that thehead will flt within the body i0 and the reduced recessed portionfltsbetween the sides of the narrow slot shown in Figure 5.

While for the purpose of illustrating and describing the presentinvention a preferred embodiment has been shown, it of course will beappreciated that such variations are contemplated in the components andin their arrangements as may be commensurate with the spirit and scopeofthe invention dei-ined in the following claim. 'This invention ishereby claimed as follows:

Airemovable nozzle assembly for use with an air brush of the type havinga valve controlled passage therethrough for a propelling fluid; andcomprising an elongated head member adapted to be secured to the airbrush and having a longitudinal fluid passage therethrough adapted forcommunication with the uid .passage in the air brush, said head memberhaving parallel bores therethrough disposed on opposite sides of saidfluid passage and extending transversely thereoi` and each adapted forconnection to a material supply line, said transverse bores having valveseats intermediate the ends thereof and said head member also havingmaterial passages each communicating with one of said bores andextending forwardlythrough said head member on opposite sides of saidfluid passage and opening at the iront end of said head member, separatevalve members, one for each of said transverse bores cooperating withthe seat therein for selective and permissive dierential control of thepassage of material through said bores to said material passages, aninternal nozzle member detachably mounted at the forwardend of said headmember in communication with the longitudinal fluid passage'therethrough and with the outer inwardly convergent surface thereofdisposed .finwardly between the outlet ends of said material passages,and an external nozzle detachably mounted at the forward end of saidhead member exteriorly of the said material passages and having theinner wall surface thereof sharply converging inwardly in advance of theadjacent Vsurface of said internal nozzle to provide therebetween aconfined mixing chamber with the inner wall surface of said externalnozzle serving to sharply direct the material from the outlet ends oi"said ymaterial passages inwardly into said mixing chamber whereby thematerials are mixed .therein before being propelled through the .secondnozzle by the nuidunder pressure issuing trom said longitudinal Yfluid.passage.

JENS A. PAASCHE.

REFERENCES ill-EEB The following references are o record in the ile orthis patent:

UNITED STATES PATENTS Number Name Date 1,185,344 VPhilibert May 30,19161,362,228 Cleveland Dec. 14, 1920 1,597,033 Gibbons Aug. 24, A1925l1,651,460 Norris Dec. 6, 1927 1,774,694 Bateman Sept. 2, v1930 1,802,602Campbell, Jr. Apr. 21, 1931 1,837,861 Green et al. Dec. 22, 19311,863,782 Young June 2i, 51932 1,903,522 Uhri, Jr. Apr. 11, 19331,944,428 Hammon Jan. 23, 1934 1,948,401 Smith et al. Feb 20, 19342,042,746 Tracy June 2, 1936 2,052,622 Hale Sept. 1, 1936 2,143,817Longdin et al Jan. 10, 1939 2,249,771 MacMartin July 22, 1941 2,335,119Hansen July`15,1941 2,356,865 Mason Aug. 29, 1944 2,380,827 Downs July31,1945

FOREIGN PATENTS Number Country Date 291,630 Italy Dec. 22, 1931

